溶胶-凝胶法制备CuMn2O4催化剂及性能研究

采用溶胶-凝胶技术,在不同络合剂体系中制备CuMn2O4催化剂,用XRD、BET法、TPR、二甲苯完全氧化等手段研究了催化剂的晶相、还原性能及催化活性.结果表明加入络合剂对提高催化剂比表面积,降低晶粒尺寸至纳米量级有明显作用,对二甲苯的催化氧化表现出优良的反应活性.     

一种多目标决策与模糊优化模型的新思想

本文主要基于多目标的决策与模糊优化模型来解决实际问题,引进线性加权法与关联系数分析法的思想提出分析法的集成思想,针对多目标决策优化问题的模糊性,运用多目标决策模糊集理论进行研究,建立数学集成思想．通过对决策问题的决策矩阵进行规范化处理,再按照运算步骤得到最优方案,在此基础上结合决策问题的灰色关联分析法和模糊优化模型从而得到更优的方法,且具有较强的可靠性和实用性,达到更好地解决实际问题。     

Novel Hyper-Redundant Manipulator-. Design, Study and Experiment

A novel hyper-redundant manipulator named RT1 is designed and studied. The unique feature of RT1 is all degrees of freedom (DOF) are actuated with only one motor via special designed hinge bar universal joints. The mechanisms of RT1 are introduced in detail. Some experiments are carried out in order to test the movability and adaptability of the manipulator. RT1 is actuated by pulse string and acts discretely. The discrete working space of RT1 is described and the parameter optimization for kinematical redundancy resolution is studied also. The optimization criterion is altering the design parameter as little as possible during manipulator's motion from the initial position to the expected position. An optimization example is given that is realized with Matlab optimize tool-box.     

不同放牧强度下天然沙质草场植物群落分异特征及沙漠化发生机理试验研究

本文通过在科尔沁沙地沙质天然草场进行连续牧压梯度试验，主要得出如下结论：随着放牧强度的增加，植被盖度，地下生物量迅速下降，连续强度牧压下沙漠化在短期内（３～７个月）强烈发展；随着牧压的增加，地下生物量与地上生物量的比值呈上升趋势，土壤含水量也上升；放牧造成的沙漠化在初期阶段相对容易治理。     

英语名人名言

All for one,one for all．人人为我,我为人人。——[法]Dumas pere 大仲马 Other men live to eat,while I eat to live. 别人为食而生存,我为生存而食。—— Socrates 苏格拉底 Easy come,easy go． but he cannot make it drink．一个人可以把马带到     

影响城镇中学生体育兴趣的因素

采用问卷调查法、文献资料法等方法对影响城镇中学生体育兴趣的因素所进行的调查，结果表明：城镇中学生体育兴趣与学校、体育课的教学内容、朋友和家庭的相关性较大。并提出相应的对策方案。     

水相中6-甲基-6-苯基-7-烯-1,5-辛二醇的合成

以DHP为原料,通过在锌介入下水相中的烯丙基化反应,合成目标产物6 甲基 6 苯基 7 烯 1,5 辛二醇.产物结构经核磁共振光谱、红外光谱和质谱得到了证实.     

苹果叶片不定芽的高频诱导及植株再生的研究

体外建立并扩繁了苹果品种“乔纳金”、“新世界”、“王林”,“北斗”的无性系,在ＭＳ附加ＢＡ０．５￣２．０ｍｇ／Ｌ、ＩＢＡ０．１￣０．５ｍｇ／Ｌ的培养基中,２个月内芽的数量可增至５倍,在ＭＳ培养基附加ＢＡ５．０ｍｇ／Ｌ ＩＡＡ０．２ｍｇ／Ｌ的下,４个品种的叶片再生率可达９０％以上,其中以“乔纳金”最高,可达１００％,当ＴＤＺ为３ｍｇ／Ｌ,ＩＡＡ０．２为０．５ｍｇ／Ｌ时,其再生频率明显高于ＢＡ。     

Iterative Method for Constructing Complete Complementary Sequences with Lengths of 2^mN

Complete complementary sequences are widely used in spectrum spread communications because of their ideal correlation functions. A previous method generates complete complementary sequences with lengths of N^nN （n,N ∈ Z^＋）. This paper presents a new iterative method to construct complete complementary sequences with lengths of 2^mN （m,N ∈ Z^＋）. The analysis proves that this method can produce many sequence sets that do not appear in sequence sets generated by the former method, especially shorter sequence sets. The result will certainly increase the application of complete complementary sequences in communication engineering and related fields.     

脉冲爆震发动机的推力测试与分析

对脉冲爆震发动机产生的推力进行了定量测定与分析,研究了混气余气系数、起爆频率和爆震频率对脉冲爆震发动机推力的影响规律．同时,通过推力的测定以验证发动机性能计算方法的正确性,掌握脉冲爆震发动机推力测试的方法．研究表明,推力测试值与理论计算值吻合较好．